After upgrade to Yosemite SMB connection to remote server no longer works. WHY?

HI,
Before I upgraded to Yosemite I had mapped a connection to a directory on a remote server using SMB.  After upgrading from OS 10.9 these connections no longer work.
Any idea why?  Nothing on either the remote network server or the SMB mapping has changed.

There appears to be a problem with Firefox 20 with UNC paths when using roaming profiles on a server.
This is currently investigated and tracked via this bug report.
*[https://bugzilla.mozilla.org/show_bug.cgi?id=857672 bug 857672] - Address Bar not working
<i>(please do not comment in bug reports: [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html])</i>

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      iMac (24-inch, Early 2009) (Verified)
      iMac - model: iMac9,1
      1 2.66 GHz Intel Core 2 Duo CPU: 2-core
      8 GB RAM Upgradeable
      BANK 0/DIMM0
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      BANK 1/DIMM0
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      S.M.A.R.T. Status: Verified
      EFI (disk0s1) <not mounted> : 210 MB
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      Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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      [not loaded] com.parallels.kext.netbridge (9.0 24251.1052177) Support
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      Print Plus (Disabled)
      ClickToPlugin (Disabled)
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      Total number of backups: 29
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